Spark-plug.



C. H. SCHLUN'DT.

SPARK PLUG.

APPLwATloN man 11m12.191s.

1,21 8,21 5. Y 1 Patented Mar. 6, 19171 the porcelain of the plug `thereof being internally will be permitted UNITED STATES PATENT, oFFoE; n

CHRISTIAN H. SCHLUNDT, :0F HUNTINGBURG, INDIANA, ASSIGNOR OF ONE-HALF T0 RUFUS KIRK AND ONE-HALF T`0 HARRISON ALFORD, BOTH 0F HUNTINGBURG,

INDIANA.

To all whom it may concern.'

Be it known that I, CHRISTIAN VH. ScnLUNnT, a citizen of the United States, residing at l-Iuntinghurg, in the county ot' Dubois and State of Indiana, have invented certain new and useful Improvements in Spark-PlugsP of which the following is a specificatioll. This invention rcontemplates an in'i'proved spark plug and has as its primary object to provide a device of this character wherein the overheating and consequent cracking Aof v will he prevented and wherein thcsoting of the plug to effect a short circuit therethrough will be obviated.

The invention has as a further object to provide a plug employing a priming cup in connection therewith and adapted to automatically feed gasolcne introduced into the cup into the engine cylinder with which the plug 1s associated.

The inve'ntionhas as a further object to provide a plug wherein currents of cool air to flow into the plug upon each suction stroke of the engine with which it is associated, tothe end that the inner terminal of the porcelain of the plug may be kept cool and wherein adjustable check valves will be provided for regulating such infiowing currents of air.

(')ther and incidental objects will appear as the description proceeds and` in the drawings wherein l have illustrated the preferredcn'lhodiment of the invention and wherein similar referei'ice characters designate corresponding parts throughout the several v1ews:-

Figure l is a vertical sectional view improved spark plug,

Fig.A 2 is a similar view showing a modified form of the invention, and

Fig. 3 is a detail perspective view of a further slight modificationof the invention showing one of the check `valve receiving sleeves ot' theplug removed.

In carrying out my invention. I employ a` plug having a substantially cylindrical body portion lwhich axially thereof is formed with 'af longitudinally tapered bore l1 opening through opposite ends of the plug, the said bore' adjacent the larger end screw threaded. Formed on the body portion l() adjacent one extremity thcreoffis a polygonal wrench receiving enlargen'ient .1.2 while the inner end of my Specification of Letters Patent.

SPARK-PLUG.

of the plug is externallyscrew threaded in the usual manner for engine cylinder.`

ADetachably fitted within the larger end of the bore 11 is a porcelain 13 which, intermediate its ends, is provided ,with an amullar enlargement seating upon a suitable annular shoulder-'14 formed in the wall of said bore. the enlargement of the ,porcelain is an annular wasl'ierl seating against the shoulder# lll., while a similar washer 11G is arranged to surround the enlargement of the porcelain at its opposite enc. Detachably engaging within the adjacent screw threaded eX` tremity of the bore 11 is an externally screw threaded annular nut or sleeve 17 surrounding the porcelain and engaging the washer 16 for urging the porcelain to seat upon the shoulder 11i. It will be noted that the inner end 18 of the porcelain is reduced and extends axially within the bore ll in spaced relation to the wall thereof.

Formed upon opposite sides of the body portion l() adjacent the upper extremity thereof, are oppositely disposed lateral annular extensions or lugs 19 which are axiallyI bored to detachably receive cylindrical sleeves or pinsA 20. T he sleeves 20 at the upper extremities thereof are provided with heads between which and the extensions 19 are preferably disposed washers 21. The sleeveslQO are provided with axial. bores 22 opening through opposite ends of the sleeves and which are reduced intermediate their ends to provide annular valve seats Freely moui'ited within the upper extremi-` ties of the bores 22 of the sleeves 20 are ball valves Q4 adapted to engage the seats 23 and which are limited iin their provide a valve cage and upon one side with a radial opening 26 communicating with a passage 27 leading into the bore 11 immediately adjacent the inner extreinityy:otn the reduced innertendV of the porcelain ll. 'The sleeves Q0, attheir lower engagement with an Detachably engaging one end of` movement away' i from the said .seats by adjusting screws 25 screw threaded within theouter extremities `of the bores 22. The sleeves 20 thus each are each provided Patented Idar. 6, 1917. Appicaticn filed May 12, 1915. Serial No. 27,621. i

Detachably coi'inected to` the inner ex- 110 tremity of the other of said sleeves, is any internally screw threaded coupling sleeve` adapted to receive the inner end of the tubular extension 31 ofa cup 32. Surround- `ing the inner extrem-ity'of the extension 31 is a coupling nut 33 which is screwpthreaded upon the outer end of the sleeve 30 for urging the extension into engagement with 'the adjacent terminal ofthevsleeve 20 supio porting the cup. rIn this connection,-it is to be observed that each of the sleeves 2() at the lower end thereof, is provided with frusto-conical seats adapted to receive the adjacent terminal of the extension 31 in the usual manner so that, if desired, the `nut 28 `may be removed 4and a cup 32 readily aty tached upon each side of the plug.

l as

- of the engine will,

i shoulder3fproviding In use, the plug'isl attached to an engine Thus, the vpossibility the porcelain andfits consequent cracking y lMounted within the porcelain 13 is an4 n 'l ,electrode 3l yarranged to within the bore 11 and adapted to-coperate, at the inner terminal thereof, with an annular.v shoulder extending radially within the bore 11 at its inner end, the a sparking terminal.

in the usual manner and it w'ill now he seen that upon each suction stroke of the enginefresh air will be drawn in through the sleeves 2'() and will then enter through the opening 26 of the said sleeves and the passages 27 to reduced extremity 18 of the porcelain 13. of the overheating of a minimum.

the combustion chamber as will be readily seen, cause the valves 24 to engage the seats 23 and consequently close the passages` to prevent ,the escape of the gases within the engine.

Particular attention is now directed to the fact that the screws 25 may be adjusted within'the sleeves 2.0 to either partially or entirely close the openings 26 formed therein and consequently regulate the currents of fresh air lfiowing intothe plug. Howwill be reduced to Explosion within Y ever, it will be observed that the ball valves 24 are adapted to move vacross the openings 26 so that the screws 25 may be adjusted to cause the said ball valves to coperate therewith in regulating the inflowing currents of air, it being merely necessary to accomplish this end, that the said screws be so positioned that the when at the limit, of their movement away from the seats '23 and in engagement with the pins 25, in a position partially or entirely closing the openings 26.

It will be noted that the inner end of the porcelain 13 isspaced a considerable distance from the inner extremity of the bore 11 so that, in use, the Haine of the explosion 'of the engine'will be prevented from backing up within the bore and sooting the porcelain. In this way, the troubles ordinarily "extend axially be directed against the innerV extension `19 are -radially hall valves will be held' experienced through this cause .will be greatly obviated andthe possibility of the short circuiting of the plug will be reduced to a minimum.

drawn in through the passages of the plug 4into the 'engine c vlinder, the plug automatically operating s to accomplish this operation. Thus, the vengine vmay vbe easily primed while the presence ofthe cup upon the plug will not in the least hamper the vinflowing currents of air passing through the plug upon eachsuction stroke of the engine.

in rig.

thereof todetachably closure plugs' or screws 10.

Screw threaded intothe outer walls of the disposed needle valves 41, the inner conical extremities of which are adapted to fit within the adjacent ends of the passages 38 to clbse the said passages. lreferahly, the valves .41 are provided with lock nuts 42. It will be seen that in this forni of the invention, the valves 41 may he adjusted to regulate the incoming iiow of fresh air currents entering the bores 2 of theI drawings, I have-disclosed ainodifiedform of the invention- 36 while the ball valves 39 are adapted to engage the seats 27 under the influence of combustion within the engine.k Otherwise, the construction of this modification is identical with that found in the preferred form of the invention and a further description thereof will, therefore, not be given.

As will be readily understood, the plug of' this modication may be provided with only one extension 19 if desired and thus equipped 4with only one check valve, the duplication of the valves being entirely a'matter of choice.

In Fig. 3 of the drawings, I have disclosed a further slight modification of the invention wherein springs 43 are disposedL within the sleeves 2.0 of the preferred form of the invention and arranged to bear between the ball valves 24 and the set screws 25, the said springs, normally urging the'said valves to engage the seats 23 .ofthe said sleeves and consequently close the assages therethrough. Thus, when this modified structure is em- 'plo ed, the ball valves .24; will be automatical y returned to normal position by the springs after having been actuated aga-inst` ,V ent is 1. A Vspark lug including a hollow body portion provi( ed with a sparking termmal, an `electrode fitted within the body portion and adapted to coact'with the said terminal,V

a hollow sleeve detachably connected to the body portion andformed with a valve seat,

there being a passage communicating interiorly'of'the said sleeve and opening into the body ofthe plug, a valve ireelymounted within'V the sleeve and adapted to engage said seat,-`an

-the sleevefor limiting the movement of the valve-away from the seat. A

l A spark' ping including a hollow body portion allied with a sparking terminal, an electrode fitted within the body portion and adapted to cooperate' with the said terminal, an-jinta'ke sleeve carried by the body portion, there being a passage leading from 'the said sleeveand opening into the body portion, a'valve freely mounted within the 'sleeve and adapted for movement across one end of said passage, and means for adjustably limiting the valvein such movement.

3. A spark lug including a hollow bod portion provid) an electrode fitted within the body. port' n and adapted to cooperate with thesaidtev minaha sleeve4 carried by the body portion `and formed to receive a valve,- there bemg a passage -communicating interiorly of the Sleeve and'entering into the body of the plug,

:a valve freely mounted in said sleeveand adapted for movement across on'e end of said passage, and a set screw adplstable `upon theY sleeve for limiting the valve in such movement: i

4. 'il spark plug including a hollow bod porti'on provided with a sparking termina an electrode fitted Within the body portion and adapted to co crate with said terminal, a valve cage carrie bythe body portion and formed with a passage opening exterior-ly of the body portion, there being a passage leading from within the cage and o ening into the body portion, a valve free y mounted within theca e, the said valve being adapted to close said first. mentioned passage and being adapted for movement across one end of said last mentioned passage, and means for limiting the 'valve in such movement.

5. A. spark plug including a hollow bod portion provided with a sparking termina an electrode fitted Within the body portion .and adapted to cooperate with said terminal,

the 'body portion being formed with apus.

sage leadin from its interior to its exterior,

a checkva ve mounted in said passage and d adjustable means 'carried byed with a sparking termina adapted formovement ,to permit an inflowing current of air to pass therethrough, and

means arranged to cooperate with the valve' the volume of such inflowing the valve and associated therewith for automatically feeding a liquid `within the cup into the plug upon movement of the valve to a position for admitting yair into the plug. 7. A spark plug inciudmg a hollow bod portion provided with a sparking termina i an electrode fitted within the body portion and adapted to cooperate with the solid` terminal, thel body portion being provided with a passage opening exterio'rly thereof and formed-with a valve seat, there being a passage leading from said first` mentioned passage .and opening. inte'riorly of the plug, a valve'freely mounted in said rst mentioned passage and adaptedfor engagement with the said seat to close the passage, and a valve adjustable upon the body portionto cooperate with said second mentioned passage for regulating a iiowlof air therethrough.

8. A-spark plug including a hollow bod portion provided witha sparking termina angel ectrode fitted within the body portionl and-adapted to cooperate with the said terminal,` the body portion having an extension formed thereon. .bored to receive a sleeve, there being aV passage opening'into the body portion and communicating withl said bore, al hollow sleeve detachably fitted in said bore and provided-with an opening .communicating with said fpassage, a. valve freely mounted within the sleeve and adapted to close the passage therethrough, an a set screw adjustable within the sleeve to project'across said 'opening forrregulating a. How of air through the sleeve.

9; A spark lug including a hollow body portion provi ed with a sparking terminal, an electrode litted within the body portion and adapted to cooperate with the said terminal, the body portion being provided with ai passage communicating exteriorly thereof and with asecond passage opening into said first mentioned passage and communicating interiorly of the body portion, a check valve arranged in said first mentioned passage and adapted to close the said passage, and means adjustable =to coperate with said; second mentioned. passage for regalati the volume of a current of air therethroug and for simultaneously limitin ment of the valve to open sai first mentioned passage,

the move- 10.l A spark lug including a hollow body portion provi ed with a passage opening exteriorly of the lug, a sleeve arranged in said passage, a va ve mounted in said sleeve and normally gravitating to close the passage-ea priming cup carried by the sleeve, and means connecting the cup with the sleeve and coperati with the bod of the plug for holding the s eeve against isplacement.

11. A spark plug including a hollow body portion 4provided with a passage opening exteriorly thereof, the passage having angularly disposed ortions, .a valve for controlling a How o air through one of said portions, and means for controlling a flow of 'air through the other of said portions and adapted to limit the movement of the valve.

' 12. A spark plug including a hollow body portion provided with a passage communieating exteriorly thereof, the passage being to coperate therewith for controlling n flow of air therethrough. v

In testimony whereof I aflix my signature in presence of two witnesses.

' CHRISTIAN H. BGBLURDT. Witnees:

Joux F. Helium, Louis J. Bmz.

the flow of nir` 

